249 research outputs found
Fine-Grained Natural Language Inference Based Faithfulness Evaluation for Diverse Summarisation Tasks
We study existing approaches to leverage off-the-shelf Natural Language
Inference (NLI) models for the evaluation of summary faithfulness and argue
that these are sub-optimal due to the granularity level considered for premises
and hypotheses. That is, the smaller content unit considered as hypothesis is a
sentence and premises are made up of a fixed number of document sentences. We
propose a novel approach, namely InFusE, that uses a variable premise size and
simplifies summary sentences into shorter hypotheses. Departing from previous
studies which focus on single short document summarisation, we analyse NLI
based faithfulness evaluation for diverse summarisation tasks. We introduce
DiverSumm, a new benchmark comprising long form summarisation (long documents
and summaries) and diverse summarisation tasks (e.g., meeting and
multi-document summarisation). In experiments, InFusE obtains superior
performance across the different summarisation tasks. Our code and data are
available at https://github.com/HJZnlp/infuse.Comment: EACL 202
360Roam: Real-Time Indoor Roaming Using Geometry-Aware 360 Radiance Fields
Virtual tour among sparse 360 images is widely used while hindering
smooth and immersive roaming experiences. The emergence of Neural Radiance
Field (NeRF) has showcased significant progress in synthesizing novel views,
unlocking the potential for immersive scene exploration. Nevertheless, previous
NeRF works primarily focused on object-centric scenarios, resulting in
noticeable performance degradation when applied to outward-facing and
large-scale scenes due to limitations in scene parameterization. To achieve
seamless and real-time indoor roaming, we propose a novel approach using
geometry-aware radiance fields with adaptively assigned local radiance fields.
Initially, we employ multiple 360 images of an indoor scene to
progressively reconstruct explicit geometry in the form of a probabilistic
occupancy map, derived from a global omnidirectional radiance field.
Subsequently, we assign local radiance fields through an adaptive
divide-and-conquer strategy based on the recovered geometry. By incorporating
geometry-aware sampling and decomposition of the global radiance field, our
system effectively utilizes positional encoding and compact neural networks to
enhance rendering quality and speed. Additionally, the extracted floorplan of
the scene aids in providing visual guidance, contributing to a realistic
roaming experience. To demonstrate the effectiveness of our system, we curated
a diverse dataset of 360 images encompassing various real-life scenes,
on which we conducted extensive experiments. Quantitative and qualitative
comparisons against baseline approaches illustrated the superior performance of
our system in large-scale indoor scene roaming
Lightweight, flaw-tolerant, and ultrastrong nanoarchitected carbon
It has been a long-standing challenge in modern material design to create low-density, lightweight materials that are simultaneously robust against defects and can withstand extreme thermomechanical environments, as these properties are often mutually exclusive: The lower the density, the weaker and more fragile the material. Here, we develop a process to create nanoarchitected carbon that can attain specific strength (strength-to-density ratio) up to one to three orders of magnitude above that of existing micro- and nanoarchitected materials. We use two-photon lithography followed by pyrolysis in a vacuum at 900 Ā°C to fabricate pyrolytic carbon in two topologies, octet- and iso-truss, with unit-cell dimensions of ā¼2 Ī¼m, beam diameters between 261 nm and 679 nm, and densities of 0.24 to 1.0 g/cm^3. Experiments and simulations demonstrate that for densities higher than 0.95 g/cm^3 the nanolattices become insensitive to fabrication-induced defects, allowing them to attain nearly theoretical strength of the constituent material. The combination of high specific strength, low density, and extensive deformability before failure lends such nanoarchitected carbon to being a particularly promising candidate for applications under harsh thermomechanical environments
Moho Depth Variations From Receiver Function Imaging in the Northeastern North China Craton and Its Tectonic Implications
A detailed knowledge of the crustal thickness in the northeastern North China Craton (NCC) is important for understanding the unusual Phanerozoic destruction of the craton. We achieve this goal by employing a 2āD wave equationābased migration method to P receiver functions from 198 broadband seismic stations, using Ps conversions and surfaceāreflected multiples. By combining receiver function images along 19 profiles, we constructed a highāresolution Moho depth model for the northeastern NCC. The results present dominant EāW Moho depth variations similar to previous observations and new regional NāS variations beneath both sides of the NorthāSouth Gravity Lineament. To the west, while a deeper Moho (ā¼42 km) appears in the interior of the TransāNorth China Orogen, a relatively shallow Moho (ā¼38 km) exists in the northern margin of the TransāNorth China Orogen to western NCC. To the east, the crust beneath the Yan Mountains in the marginal area is thicker (ā¼32ā40 km) than that (ā¼26ā32 km) beneath the Bohai Bay Basin in the craton interior, and the Moho further shallows from NE (ā¼32 km) to SW (ā¼26 km) within the basin. Along with other observations, we conclude that the dominant EāW difference may have been associated with the PaleoāPacific plate subduction under eastern Asia since the Mesozoic. The newly observed complex NāS variations may have reflected the structural heterogeneity of the cratonic lithosphere inherited since the formation of the NCC in the Paleoproterozoic, or spatially uneven effects on the cratonic lithosphere of subsequent thermotectonic events during the longāterm evolution of the craton, or both.This research
is funded by the National Natural
Science Foundation of China (grant
41574034, 41688103, 91414301).
Figures are made with GMT
(http://gmt.soest.hawaii.edu) and
MATLAB softwares
(https://www.mathworks.com)
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Deformation characteristics of solid-state benzene as a step towards understanding planetary geology
Small organic molecules, like ethane and benzene, are ubiquitous in the atmosphere and surface of Saturnās largest moon Titan, forming plains, dunes, canyons, and other surface features. Understanding Titanās dynamic geology and designing future landing missions requires sufficient knowledge of the mechanical characteristics of these solid-state organic minerals, which is currently lacking. To understand the deformation and mechanical properties of a representative solid organic material at space-relevant temperatures, we freeze liquid micro-droplets of benzene to form ~10 Ī¼m-tall single-crystalline pyramids and uniaxially compress them in situ. These micromechanical experiments reveal contact pressures decaying from ~2 to ~0.5 GPa after ~1 Ī¼m-reduction in pyramid height. The deformation occurs via a series of stochastic (~5-30 nm) displacement bursts, corresponding to densification and stiffening of the compressed material during cyclic loading to progressively higher loads. Molecular dynamics simulations reveal predominantly plastic deformation and densified region formation by the re-orientation and interplanar shear of benzene rings, providing a two-step stiffening mechanism. This work demonstrates the feasibility of in-situ cryogenic nanomechanical characterization of solid organics as a pathway to gain insights into the geophysics of planetary bodies
CoBEV: Elevating Roadside 3D Object Detection with Depth and Height Complementarity
Roadside camera-driven 3D object detection is a crucial task in intelligent
transportation systems, which extends the perception range beyond the
limitations of vision-centric vehicles and enhances road safety. While previous
studies have limitations in using only depth or height information, we find
both depth and height matter and they are in fact complementary. The depth
feature encompasses precise geometric cues, whereas the height feature is
primarily focused on distinguishing between various categories of height
intervals, essentially providing semantic context. This insight motivates the
development of Complementary-BEV (CoBEV), a novel end-to-end monocular 3D
object detection framework that integrates depth and height to construct robust
BEV representations. In essence, CoBEV estimates each pixel's depth and height
distribution and lifts the camera features into 3D space for lateral fusion
using the newly proposed two-stage complementary feature selection (CFS)
module. A BEV feature distillation framework is also seamlessly integrated to
further enhance the detection accuracy from the prior knowledge of the
fusion-modal CoBEV teacher. We conduct extensive experiments on the public 3D
detection benchmarks of roadside camera-based DAIR-V2X-I and Rope3D, as well as
the private Supremind-Road dataset, demonstrating that CoBEV not only achieves
the accuracy of the new state-of-the-art, but also significantly advances the
robustness of previous methods in challenging long-distance scenarios and noisy
camera disturbance, and enhances generalization by a large margin in
heterologous settings with drastic changes in scene and camera parameters. For
the first time, the vehicle AP score of a camera model reaches 80% on
DAIR-V2X-I in terms of easy mode. The source code will be made publicly
available at https://github.com/MasterHow/CoBEV.Comment: The source code will be made publicly available at
https://github.com/MasterHow/CoBE
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